function createXMLHttpRequest()
       {
              try
              {
                     var xhttp = new XMLHttpRequest();
              }
               catch(e1)
               {
                     try
                     {
                            var xhttp = new ActiveXObject("Msxml2.XMLHTTP");
                     }
                catch(e2)
                {
                     try
                     {
                            var xhttp = new ActiveXObject("Microsoft.XMLHTTP");
                     }
                 catch(e3)
                 {
                            xhttp = false;
                 }
                }
              }
              return xhttp;
       }